97666717978 has 8 divisors (see below), whose sum is σ = 146649113568. Its totient is φ = 48783680124.

The previous prime is 97666717937. The next prime is 97666718033. The reversal of 97666717978 is 87971766679.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 97666717978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24836976 + ... + 24840907.

It is an arithmetic number, because the mean of its divisors is an integer number (18331139196).

Almost surely, 2^97666717978 is an apocalyptic number.

97666717978 is a deficient number, since it is larger than the sum of its proper divisors (48982395590).

97666717978 is a wasteful number, since it uses less digits than its factorization.

97666717978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49678868.

The product of its digits is 336063168, while the sum is 73.

The spelling of 97666717978 in words is "ninety-seven billion, six hundred sixty-six million, seven hundred seventeen thousand, nine hundred seventy-eight".